All the scenes involving the two murdered men are taken directly from the earlier mystery called The Kennel Murder Case (1933), in which William Powell played Philo Vance. In both movies, most of the dialog in the scenes pertaining to the murders and the investigation is exactly the same, word-for-word, which clearly indicates that the script from the 1933 film was adapted to the story for this film, which focuses on the theft of secret aircraft plans. However, in "The Kennel Murder Case", the plot concerns stolen Chinese art objects.
McTavish was played by Terry the cairn terrier, who more famously portrayed Toto a year earlier in The Wizard of Oz (1939).
This film's earliest documented telecasts took place in Tucson Friday 5 October 1956 on KDWI (Channel 9) and in Albuquerque Friday 12 October 1956 on KOAT (Channel 7); it first aired in Salt Lake City Saturday 27 October 1956 on KUTV (Channel 2), in Indianapolis Monday 5 November 1956 on WTTV (Channel 10), in Salt Lake City Saturday 17 November 1956 on KUTV (Channel 2), in San Francisco Friday 7 December 1956 on KPIX (Channel 5), in Sacramento CA Sunday 27 January 1957 on KBET (Channel 10), and in Honolulu Friday 10 May 1957 on KHVH (Channel 13).